AES256 encryption on Android

AES256Cipher.java

package net.dealforest.sample.crypt;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.InvalidAlgorithmParameterException;
import java.security.spec.AlgorithmParameterSpec;

public class AES256Cipher {
	
	public static byte[] encrypt(byte[] ivBytes, byte[] keyBytes, byte[] textBytes) 
			throws java.io.UnsupportedEncodingException, 
				NoSuchAlgorithmException,
				NoSuchPaddingException,
				InvalidKeyException,
				InvalidAlgorithmParameterException,
				IllegalBlockSizeException,
				BadPaddingException {
		
		AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivBytes);
    	SecretKeySpec newKey = new SecretKeySpec(keyBytes, "AES");
    	Cipher cipher = null;
		cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.ENCRYPT_MODE, newKey, ivSpec);
		return cipher.doFinal(textBytes);
	}
	
	public static byte[] decrypt(byte[] ivBytes, byte[] keyBytes, byte[] textBytes) 
			throws java.io.UnsupportedEncodingException, 
			NoSuchAlgorithmException,
			NoSuchPaddingException,
			InvalidKeyException,
			InvalidAlgorithmParameterException,
			IllegalBlockSizeException,
			BadPaddingException {
		
		AlgorithmParameterSpec ivSpec = new IvParameterSpec(ivBytes);
		SecretKeySpec newKey = new SecretKeySpec(keyBytes, "AES");
		Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
		cipher.init(Cipher.DECRYPT_MODE, newKey, ivSpec);
		return cipher.doFinal(textBytes);
	}
}

can u please provide the length of the input parameters byte[] ivBytes, byte[] keyBytes, byte[] textBytes

I'm sorry for late reply
I have sample code at the bottom of the mime blog.
I think I can understand if you look at it.

http://blog.dealforest.net/2012/03/ios-android-per-aes-crypt-connection/

What's the block size on that cipher? Is it 16 by any chance?

The function name says AES256, but the cipher string is just "AES/CBC/PKCS5Padding" - how does that work?

http://blog.dealforest.net/2012/03/ios-android-per-aes-crypt-connection/

"Unsupported key size: 8 bytes". how to solve this @dealforest

@dealforest the block size is of 16 byte, is there a way to make it 32byte? I prefer if u use AED128 instead of AES256 for this.

You have been such a help, thanks!